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Articles by L. Fekri
Total Records ( 2 ) for L. Fekri
  L. Fekri , A. Jafari , S. Fekri , A. Shafikhani , M. Vesaghi and G. Behzadi
  In this study by Thermal Chemical Vapor Deposition (TCVD) method, the synthesis of carbon nanotubes (CNTs) and temperature affects on the grown CNTs on the NiSio2 catalyst and 304-type stainless steel was investigated. The purification of the grown CNTs on the 304-type stainless steel was also investigated in this study. The synthesis and purification of the samples were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), termogravimetric analysis (TGA) and Raman spectroscopy. Our obtained result by SEM and TEM shows that densities of CNTs growth on the 304-type stainless steel are more than the CNTs growth on the NiSio2 catalyst and both of them have a bamboo structure. The synthesis of CNTs in the range 750 to 850°C are also investigated in this study. Optimum temperature for synthesis of CNTs on the NiSio2 catalyst is about 825°C and for the 304-type stainless steel is about 750°C. The purification process includes oxidation in the range 450to 750°C, washing with 5 mol hydrochloric acids, disperse with ultrasonic and filtration. Our obtained result by TGA indicates that the CNTs burn in 600°C. A comparison of the Raman spectroscopy before and after of purification shows that the D-band shape is less than the G-band that due to the samples purified. Hence, the reported 304-type stainless steel provides a good sample for synthesis of CNTs by TCVD method.
  G. Behzadi , L. Fekri and H. Golnabi
  In this study, operation of the contact Cylindrical Capacitive Sensor (CCS) for the reactance capacitance measurement of the water liquids by using the charge/discharge measurement module is investigated. The effect of geometric factor on the capacitance measurement of different liquid samples is also studied. The measured capacitances for the distilled, mineral, tap and salt water samples are reported by using two contact CCSs with the active length of 16 and 74 mm. The measured capacitances by small contact CCS for the salt water is 1.76 μF and by big contact CCS is 47.8 μF, which shows a big difference for different probes. In another study, the effects of the liquid conductance on the capacitance values are theoretically investigated. The obtained results for different water liquids show that by increasing the conductance of the sample liquids both the stream discharge current and the stored load charge on the cylindrical electrodes are decreased, accordingly.
 
 
 
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